<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
    <title>Document</title>
</head>
<body>
    <div id="app"></div>
    <!--<div>{{message}}</div>-->
   <template id="root">
        <div>{{myNumber}}</div>
        <button @click="increment">+1</button>
        <button @click="decrement">-1</button>
        </template>
    <script>
        //创建应用实例
        const app=Vue.createApp({
           // template:'div>{{message}}</div><span></span><span></span><span></span><span></span>',
           template:"#root",
           data() {
            return {
               myNumber:1,
               
               
            }
           },
        methods:{
            increment(){
                this.myNumber++
            },
            decrement(){
                this.myNumber--
            }
           
        }
        })
       const root= app.mount("#app")
    </script>
</body>
</html>